Artificial respiration and aspiration apparatus



I M. DANN 2,382,610 ARTIFICIAL RESPIRATION AND ASPIRATION APPARATUS Aug. 14, 1945.

Filed Dec. 26, 1941 3 Sheets-Sheet 1 Mg H A TTOFPNEYS.

M. DANN Aug. 14, 1945.

ARTIFICIAL BESPIRATION AND ASPIRATION APPARATUS Filed Dec. 26, 1941 -3 Sheets-Sheet 2 ATTORNEYS.

M. DANN Aug. 14, 1945.

ARTIFICIAL RESPIRAIION AND ASPIRATION APPARATUS I Filed Dec. 26, 1941 s sheets-sheet s.

Patented Aug. 14, 1945 ARTIFICIAL RESPIRATION AND ASPIRATION APPARATUS Morris Dann, Cleveland, Ohio Application December 26, 1941, Serial No. 424,515

4 Claims.

This invention relates to apparatus for artificial resuscitation and aspiration, and novel means of controlling the devices used in artificial respiration and artificial aspiration.

At the present time,there are many different methods of effecting artificial respiration, sometimes called resuscitation, and included in these methods is the manual method. In this manual method, there is not any certain way of controlling the pressure that is externally applied to the person requiring resuscitation, and in some cases the lungs are in such a collapsed condition that mere external application of pressure is not sufficient to effect respiration. Any lack of skill on the part of the person administering the resuscitation or inability to continue application of manual resuscitation will be seen to prevent the actual desired result, wherein artificial resuscitation is necessitated. Even in manual method of resuscitation, it is generally necessary to have a certain amount of equipment to properly complete the renewal of respiration in the patient.

Mechanical means of one kind or another have been contemplated, and the well known iron lung so-called, is an example of the type of artificial respiration apparatus heretofore devised. Of course, the iron lung is limited in certain ways because it is expensive and difiicult to transport from one place to another, and is only in certain cases used to-efi'ect artificial resuscitation as such.

Further methods have been contemplated whereby oxygen is introduced through the respiratory tract in some form and by certain means, but no adequate method of control of the introduction of the oxygen has been 'heretofore contemplated. Of course, his seen that where uncontrolled use of oxygen is employed, the artificial resuscitation is no more effective than by not actually attempting to resuscitate the person.

Necessarily, in many cases, it is necessary as an accompanying adjunct to the artificial resuscitation method, to remove certain obstructionsfrom the respiratory tract, such as for instance in new born babies, the mucous formations, or in certain instances, in various types of illnesses in adults or children, similar mucous formations'are present and are necessary to be removed.

The present methods of aspiration of forei n liquids in respiratory tracts have not previously been very greatly experimented with, and, generally, heretofore, involved theinsertion on the part of a physician, or other competent person,

of one end of a catheter tube at the source of foreign liquid or mucus, and then inserting the other end in the mouth of the physician, and by manual vacuum created in thetube, to withdraw'the mucus. :Of course, a trap is commonly inserted in the catheter tube line between the source of foreign liquid or mucus, and the physicians, or' other personsmouth, to collect the mucus. f v

In view of the foregoing recitation of the general field to which this invention is directed, the objects of this invention are to provide adequate means of applying artificial respiration or resuscitation, whereby the apparatus for accomplishing these results will be portable, simple to manufacture, relatively inexpensive, and accomplish the resuscitation in a of time, and with a minimum of danger for the person to whom the artificial respiration is being applied. I A further object of this invention is to enable the operator of the apparatus to very closely control the administration of oxygen, and at the patient same time, have the actual administration performed an automatic manner.

Affurther, and more particular object of this invention is to, provide apparatus that will be operated by the source of oxygen being administered to the patient in order to prevent any possibility of explosion where the apparatus is used in'an ether filled room, or where other explosive fumes are present.

A still further object of this invention is to provide a manometer control means whereby the manual control of the administration of oxygen is augmented by an'automatic control eliminating in many cases the element of human error which prevents effectual artificial resuscitation.

- This automatic control provides a safety feature for the resuscitation apparatus that is wholly new in this art.

' A still further and more particular object of this invention is to provide a novel form of apparatus to' carry out the aspiration of foreign liquids in the respiratory tract prior to applica-,

tion of artificial respiration. I Another object "of this invention is to provide apparatus that is comprised of relatively few working parts and prevent contamination of any of the parts by the liquid withdrawn from the I to which the aspiratory apparatus is applied. Further and more particular objects of the inventionjwillbe understood upon reference to the drawings, in'which:

Figure is an end view of Figure 4, showing the general outline of the air motor unit and location of various parts.

Figure 6 is a detail sectional view of a portion of the air motor unit taken about onthe line 6-6 of Figure 5.

Figure '7 is a detail view of the aspirator unit with certain portions shown in section, and other parts broken away, showing the relationship of collecting means and air motor unit.

Respirator unit Referring to the drawings, in Figure l the numeral I designates generally a carriage or carrier for the apparatus and 2 indicates a tankof conventional form adapted to contain oxygen. The numeral 3 indicates a shut-off valve located on the oxygen tank, and 4 a volume valve associated therewith, whichis of conventional form and used in a conventional manner, as associated with'storage tanks for compressed gases in general. The number 5 generally designates an air type motor and control unit, '6 a respiratory mask of conven tional form connected with the motor 5 by a suitable tubing 5a. The numeral 1 indicates a manometer control unit generally indicated thereby and located adjacent the motor unit aforesaid. The numeral 8 indicates, as a whole, the aspirator actuating unit, and 9 the aspirator unit indicating and receiving receptacle, or more simply, a trap. aforesaid, I l a mainsupplyline from the oxygen tank'2 to the air motor'un'it 5, to supply the oxygen thereto'and supply oxygen as controlled by the motor unit to the respirator mask. l2

indicates a supply line whereby oxygen is sup- :plied to the aspirator unit 8 and associated mechanism.

The carriage I is made up to be carried by suitable rubber tired wheels .l3, connected ma tubular frame, which, ror the purposes-of this invention, is made up of one piece'of tubing'and formed with the upright members IE connected by a transverse tubular section I! at their upper portions, and having .at the lower ends thereoftubular members [8, extending'rearwardl'y from the pivots of the wheels .l'3,.and-downwardly ex- 'disposed between the arms which connect the uprightmembers It, with'the transverse member 11, is a platform 22 ,which'supports the airmotor unit 5, said motor unit 5, in turn .being supported by triangular members 24, whichI-are'conne cted to the platform 22 in any suitable manner.

A tubular member 25 connects the lower plat 10 is the catheter tube with the trap'&

form 20 with the upper platform 22 and serves as a bracing means for the carriage l and also as a mounting member for the aspirator unit 8, which may be fastened to this upright tubular member 25 in any suitable fashion. A drawer 23 is slidably mounted in any suitable way on the under side of the upper platform 22, and is furnished for storage and carrying of spare parts for the apparatuses.

- The platform 22 serves as a mounting member for the manometer control unit, generally desig- I the manometer unit frame and located generally betweenthe respirator unit 5 and the adjacent tank 2.

Referring more particularly to'Figure 4, for the construction of .the motor unit 5, and associated control and supply mechanism, the unit 5 comprises an outer shell 28 of a tubular form with substantially round end member 29 which receives the open end .28 of the respirator unit 5, in an annular groove formed therein, and fastened thereto in a conventional manner. The other end 3| is also generally of round configuration and also is located on the opposite open end of the tubular shell 28 which is adapted to be received in an annular groove 32 and likewise fastened thereto by suitable means.

It is to be understood that in the mechanism, generally to be described, and heretofore described parts, that are exposed to atmospheric conditions and operate in the atmosphere, are coated with a suitable-metallic coating which will prevent corrosion and permit a certain amount of sterilization,

The substantiallyround end member 3| has a mechanism housing 33 integrally cast therewith, and extending therefrom.

The motor'generally indicated at 34 operates in a conventional manner and is adapted from a vacuum operated windshield wiper motor of conventional design, to act as pressure motor.

United States Patent Reissue No. 15,502 granted December 5, '1922, illustrates such a windshield cleaner motor of the conventional design illustrated. I

One end of the cylindrical casing 35 is suit- .ably fastened substantially centrally to the end member 3|, by means of'bolts 31 adapted to be received by a flange portion 38 of the cylindrical casing :35, and threadedly engaged with the end member 3|. Fitted in the cylindrical casing 35 are piston members 39 and 38' connected by a piston rod 40. A connecting passage 4|, cast in the cylindrical housing '35, is adapted to alternately connect air chambers formed by the pietons 39 and-38', and the cylindrical casing 35, as

permitted by :suitable valve mechanism.

of female threaded portion N, the :piston 39' .be-

ing engaged by a .male threaded :portion 35 of the valve 43. Intermediate the-ends of the valve 43 is a tapered portion 46, best seen in Figure 6, whereby the oxygen is gradually :admitted to'the patient-and gradually cut-off from the patient,

- as will be morepanticularly described hereinafter.

[The valve portion forms a valve chamber 46a in the casing 33. i V k I A passage 41. formed in the housing 33 is :the means by which oxygen from the storage tank 2,

passing through the conductor ll connected by an adaptor 53 having a threaded member 54 to engage a complemental threaded opening of the casing 33 aligned with a connecting passage 55 and chamber 56 in which the needle valve 480; erates, enters the chamber 46a formed by the valve 43 in open position. Suitably adjustable in the passage 41 is the needle valve 48 with the threaded stem portion 49 operating in the threaded screw portion 49' of the casing 33 and operable by a handle or knob means 50 to regulate the Volume of flow of oxygen around the tapered portion 46 of the valve 43 to the outlet passage and by this passage, to an exhaust and inhalation chamber or passage 52 for purposes to be described.

The chamber 52 in the casing 33 serves as a passage for the entrance of oxygen to the large chamber C formed by the casing 48 of the air motor unit, and thence to the respirator mask by means of a passage 51 in the end member 3!, to which is connected an adaptor 58 by suitable means, and On which the respirator tube Bot has been placed. Likewise, at certain times, I the chamber 52 serves as a passage for the used oxygen to the atmosphere, through the passage '59 and to the outlet 60 on which a perforated cap 33a is placed, when the valve 43 has moved to the left from its position in Figure 6 far enough to permit the flow of the used oxygen through the passages 52 and 59 when the valve 43 has moved sufiiciently to open this passage 60 to passage 59.

The conduction of oxygen for operation of the motor 34 is effected by means of the passage 6! connected with the chamber 56 in which needle valve 48 operates. Aligned with the opposite end of passage BI is a threaded connecting adaptor 62, with which metal tubing 63 is connected by a slip.ni1t 64, the tube 63 connected at its other end'to a by-pass adaptor 65 by a similar slip nut 66. Intermediate the slip nut 66 and threaded connection of adaptor 65 with the end member 3|, is a by-pass opening 61. Control of oxygen entering the by-pass tube 68, and thus control of speed of movement of the piston unit 394ll--39', is effected by a needle valve of conventional form controlled by a knob or handle 60 adjacent the end member 31. A by-pass tube 68 conveys oxygen to act on the piston means 39 to move the piston 39 to move valve 46 to the right as seen in Figure 4.

Connected to the adaptor 58 adjacent the tube 611 which is connected with the respirator mask 6, is the manometer line 21, whereby the manometer unit 1 is placed in the circuit of the oxygen in its passage from the motor unit 5 to the mask 6 for purposes to be later set forth.

The manometer control unit, generally indi cated 1, in Figure 2, is of special construction, and comprises a bottom plate I2 of generally square configuration having an indented portion 13 therein, adapted to receive the closed lower end of a glass tube or vessel 14 of relatively great length as compared with its diameter, said tube formed near its upper end with an enlarged portion 15.

The upper end of the tube 14 is closed by a top plate 16 which is adapted to receive the end of the tube in an annular groove 11 positioning the tube 14 in the device in cooperation with the indentation 13 in the lower plate 12. Tie rods 18, having suitable head portions 18a, pass through the upper plate 16 and the lower plate 12, and by means of the threaded ends 26, position the unit as a whole, and firmly maintain the unit on the upper platform 22. of the carriage, l.. The tube. or vessel I4 is open to the atmosphere through the passage 19 i a filling and :venting member x suitably fixed in the top plate 16.

A U-shapedglass indicator tube 8| of ismall diameter is so formed that itgenerally conforms to the inner surface of theglass vesselq'l4, but spaced somewhat therefrom, one end 82 suitably held in an adaptor 83, said adaptor. 83 being threadedly engaged with a suitable threaded opening in the upper plate 16 and at the outer end engaged to the supply tube 21 by a slip nut 84, whereby pressure at the respirator mask 6 is the same as the pressure in the tube 21 and the glass tube 8|.

The indicator tube 8| is formed with a curved portion at the end 85, adapted to direct water forced from the end of the tube 8| in the course of operation of the respirator unit, against the enlarged section; 15 of the vessel 14, to prevent splashing of the water which would interfere with visibility of the level of the liquid in the indicator tube 8|. 1 An opening 86 in the wall of the tube 8 I, and properly spaced from the end of the tube, 85, below the surfac of the water in the vessel 14, provides a filling opening for the. in-' dicator tube 8| after said tube has been partially emptied by pressure directed thereto by means heretofore described.

A graduated scale 81 formed from suitable noncorrosive material, is adapted to besupported by suitable means, as wires 88, on the indicator tube 8|, as shown in Figures 2 andB, and in such a position, that the scale of the apparatus laid out thereon is visible to the operator of the respirator unit. The scale 81 will be preferably of a length to provide for the indication of pressure from zero" to twenty five centimeters of water in view of the fact that present day knowledge teaches that a high of twenty two centimeters of water in atube of suitable cross section indicates the maximum pressure human lungs can withstand. Of course, it is understood that a proper scale could likewise be laid out where mercury or other liquid is the indicating medium, in cooperation with some other measuring graduation suitably calibrated.

For the purposes of this invention, however, water is used as a measuring medium, and the scale 81 is lined in for centimeters, the water level corresponding with the zero reading of the scale 81, when the apparatus is not operating and at certain times in the operation of the respirator unit.

From the foregoing, it will be readily seen that pressure oxygen being furnished to the respirator mask 6 will be measured by a displacement of the water in the indicator tube BI, and the exact pressure may be observed by comparison of the level of the water in the tube Bl with the graduated scale 81 coordinated therewith.

It is also apparent that any excessive pressure above that desired to be administered through the respiratory mask 6 would be at least partially allowed to escape through this previously described connection of respirator mask tube 6a with manometer control unit supply tube 21, through the indicator tube 8|, thence to the atmosphere through the opening, 85 of the tube 8! and the vent 19 of the vessel 14.

Under certain conditions where the use of, the manometer unit I in the circuit is not desired, a shut-off valve H of conventional construction, see Figure 6, is provided.

The purpose of the manometer unit 1 is, thereiore, seen to be to control the pressure and to indicate the pressure of the oxygen administered to the patient by the operation of the respiration apparatus, but primarily the manometer unit 1 is used as a safety device to permit the escape of excess pressure transmitted to the respirator mask 8, as before described, and this connection and unit used in this manner are believed to be wholly new in the art of artificial resuscitation.

Aspirator unit The aspirator unit, previously generally referred to as being comprised of an aspirator unit actuating mechanism 8, indicating and receiving receptacle or trap 9 and the catheter tube I0, is mounted on the.tubular carriage member 25 in any suitable manner, and is more particularly illustrated in Figure 7, wherein a cylindrical shell 89, adapted to be closed by substantially circular end members 90 and 9|, is shown in section.

An annular recess 92 in the end member 9| engages one end of the shell 89, and a similar recess, not shown, of the end member 90, engages the other end of the shell 89, and these are held in position by suitable bolts 93 and 94, which engage portions of the working mechanism of the unit located substantially centrally of the shell 89. The connection of the bolts 93 and 94 with the end closure members 90 and 9! is likewise seen to support the mechanism of the unit within the shell.

A boss formed on an angular fitting I03 is designated at I02, and is adapted to form a threaded connection for the bolt 94 to the part 90. Pressure motor 95, similar to that used in the respirator mechanism before described, is comprised of a cylindrical casing sehtion 96; cupshaped end section 91 fitted with an air tight joint to the section 96, and containing similar valve mechanism to that before referred to, is

, used in this apparatus likewise,

The end opposite the cup-shaped member 91, which encloses the valve mechanism, is connected to a vacuum pump generally indicated at 98 by suitable bolts 99 adapted to be receivedby the flange portion I in a mating flange portion |0I of the pump 98. Other details of the mechanism of this motor 95, that are the same as previously described in connection with the motor of the respiratory unit, will not be further enumerated.

Oxygen for actuation of the motor 95 is furnished from the storage tank 2, through the hose I2 to an adaptor I04, suitably mounted in the shell 09, and by means of the tube I05, which is, in turn controlled through the needle valve I06 of conventional construction, by a handle I 01,. thence to the angular fitting I03 of the cap 91 by the tube I08. The needle valve I 06 is suitablymounted in the shell or casing 89 so that a knob or handle I0! is accessible to the operator for ad-- justment of the speed of reciprocation of the pis-- ton unit by regulation of the valve to allow moreor less oxygen to be used to actuate the piston I18, and piston I I9.

A vacuum pump, generally designated as 98'- and of somewhat conventional construction, similar to that used in automobiles to pump the fluid. from the storage tank to the carburetor or other fuel mixing means, is associated with the previously described motor and is comprised of an up-- per casing or body member I09, and a lower substantially cup-shaped member IIII having a bot-- tom ll0a.

The upper casing or, body member I09 and. lower casing I I 0 are connected together in a1ignment by means of bolts I I I, suitably engaged with,

the flange member II2 on the upper casing I09 and threadedly engaged with a flange member I I3 with the lower casing H0. A flexible membrane or diaphragm H4 is adapted to have its periphery engaged by the respective flange members of the aforesaid casing members an between those flange members thus forming a chamber or socalled vacuum chamber E above the diaphragm H4. The upper chamber or vacuum chamber E is closed by a cap member I I5 secured to the upper casing I09 by means of the bolt 93, previously described, which engages a cross member I ii attached to the outer end of the casing member I09 at its ends.

The diaphragm H4 is operable by means of a piston rod I H, which is secured at one end in the piston member H8 by a threaded engagement therewith, in a manner similar to the connection of the previously described valve member 43 to the piston 39 of the respirator air motor 34. The piston rod H1 is adapted to reciprocate in connection with the piston I I8 in a similar manner to the previously mentioned valve member 43..

The piston rod I I1 is engaged with the diaphragm II4 by means of nuts I20 and I2I. Entrance of air into the lower chamber formed by the diaphragm I I4 and the cup-shaped body member U0 is eflected by means of an opening I22 in a side wall of the casing H0 to prevent any pressure or vacuum formation in this chamber, which will be designated D.

A check valve I23, which provides escape of air on the up-stroke of the piston rod I I1 and adapted to close on the down-stroke thereof, is associated with the upper casing in any suitable manner, and is of a somewhat conventional form. The check valve I23, when in a closed position, provides the means of effecting a vacuum in the chamber E, which is transferred through a similar check valve I24, to the ,aspirator collecting unitor trap 9, which is connected to the vacuum pump .by a tubing I25 threadedly engaged with the pump and engaged with the outer shell 89, as bymeans of collars I26 and I21.

The tubing I25, being of rigid construction, isadapted to engage with a. special .cap I28, which forms .an air tight seal with the glass bottle I29 of the trap member 9 by means of a passage 1 30 in the cap I20, which is connected with and aligned with the tube I25, whereby the vacuum created in the chamber E of the vacuum pump 98 is transferredto the bottle I29.

A glass tube I3I in the bottle I29 is suitably held in engagement with the special cap I28 by an adaptor I32 and so disposed as to bring the open end I33 of the tube I3| proximate the bottom of the bottle I29. A passage I43 in the cap [28 is aligned with the upper end of the tube I3l and in turnaligned witha threaded adaptor I35 having a suitable air passage therein, which in turn is connected to the catheter tube I0, in any suitablemanner, whereby the vacuum, in the bottle I29 formed by the pump .98, is transferred to thezcatheter tube, and liquid or.mucus withdrawn fromthe patient, to whom the catheter tube has been applied, will be drawn through the tube and becollectedinbottlei29.

The foregoingarrangement of bottle and .glass tube located therein does .not ,permit the mucus oriother foreign liquid ,being vwithdrawn, to come in'contact with ithe pump.

.A clearer understanding of the pump and associated mechanism of this portion of the invention,=and the manner-in which it is operated, will be brought out in-asdescription of the operation of the aspirator unit now following, in which the operation of the respirator unit and its associated mechanism, will at first be described.

Operation of apparatus The respirator mask 6, having been first placed over the mouth and nose of the patient and suitably held in engagement therewith, the valves 3 and 4 of the storage'tank 2 are opened. The

valve 50 is then opened, permitting oxygen to act on the piston unit 3940-39, causing reciprocation thereof, and thus reciprocation back and forth of the slide valve 43 connected thereto. The

valve 69 is then opened, permitting the OXygen' from the storage tank 2 to be directed toward the respirator mask 6, as described hereafter.

Oxygen is permitted to enter the respirator mask tube 6a, as the valve surface 46, around which the chamber 46a of the valve mechanism is formed, gradually opens when moving from left to right. The alignment of the passages 41 and 5|, and their connection, is thus effected by the chamber 46a, formed by the valve surface 46, and oxygen thus enters the passage 52, thence proceeds to the opening 51 aligned with the respirator mask tube 6a. This action takes place as the valve 43 is carried back and forth by the motor piston. The shape of the valve surface 46 causes the introduction of oxygen to the respirator mask, as before described, in a gradual manner, because of the conformation of this surface, whereby a gradual introduction of oxygen is accomplished, and the maximum amount is admitted when the valve surface 46 is in its full right position, as exemplified somewhat in Figure 6, and then gradually cuts off admission of oxygen when the valve 43 on which the tapered surface 46 is located, until it is entirely out off in a full left position of the valve member 43.

This action is seen to be constant, and even, with complete control over the volume of oxygen admitted and variation of the speed of operation seen to be obtainable.

, As the valve 43 approaches its maximum left position, atmospheric pressure on the patients lungs eifects the collapse of the lungs and forces the contents thereof back through the respirator mask tube 6a and through the passages 52 and 60, of the respirator unit, thence to the atmosphere.

The manometer control unit 1, connected to the line 6a, of the respirator mask 6, is seen to be alternately actuated during the course of operation of the respirator air motor unit. That is, the fiuid in the indicating tube 8| is forced out when oxygen is admitted by the slide valve 43 of the motor unit 5, and the exact amount of pressure applied may be observed by the operator of the apparatus and controlled by the means 50 and 69, in accordance'with the pressure, as shown on the scale 37, of the manometer control unit 1.

It is well known that the capacity of lungs of individuals vary, and thus, in view of certain standards set up for approximate pressure, which various persons are able to withstand, and somewhat in accordance with the age and other factors, the manometer control unit I registers accurately the actual pressure, and if for some reason the setting of the speed and volume controls,

and the amount of oxygen admitted by the valve 43 is too great for the person receiving artificial respiration, the excess pressure, and consequently some oxygen associated in the course of administering this pressure, will be relieved from the patient through the escape of the oxygen and relief of the pressure from the end of the tube 8| and to the atmosphere by bubbling through the liquid in the manometer vessel 14, and forcing the liquid out of the indicator tube 8!. Upon release of the pressure or escape, as the case may be, it is obvious that the manometer control unit I is automatically conditioned, and reset to again receive and disclose the pressure of operation.

The foregoing description will show that the operator of the mechanism or apparatus is enabled by careful observation to adjust the needle valves 50 and 69 in accordance with the demands of the patient, and the capacity of the lungs and other factors apparent to those who will use the apparatus.

The conditions under which artificial respiration may be effected are subject to variance, and factors, such as stoppage of the trachea or parts of the passages of the throat must be overcome, and in order that any mucus restriction or other foreign liquid restriction in these passages can be removed the aspirator apparatus heretofore specifically described has been constructed by means of which the artificial aspiration is administered.

A description of the operation of the aspirator unit just previously described, as to detail parts and certain functions, will be seen to more clearly illustrate the cycle of operation, and is as follows:

The catheter tube ill of conventional construction and generally composed of material of a rubber fabric or type, is inserted at the point where the mucus, or other substance, is located, and the valve I01 of the aspirator unit 8 is-opened, and thus the motor is started into operation by the pressure of oxygen entering the cylinder chambers at the ends of the piston members, as for instance, piston member H8, as alternately permitted to do so by the valve mechanism located in the cap 91.

Movement of the piston unit causes a flexing of the diaphragm H4, and on the down-stroke of the piston creates a vacuum in the chamber E of the vacuum pump 98, which is transmitted by the tubular connection I25 to the interior of the glass receptacle or trap member I29, and hence through the glass tube l3! to the catheter tube Ill and thus draws the mucus, or other liquid, from the patient into the bottle I29 and collects it there.

It is understood that the bottle I29 may be of convenient size to hold a quantity of withdrawn liquid. It is, of course, obvious that the bottle I29 may be unscrewed from the cap I28 and the liquid collected by the previously mentioned means may be suitably removed therefrom.

The actual rate of withdrawal of the liquid from the patient will, of course, depend upon the speed of the piston H8, and the amount of vacuum created in the vacuum pump 98 will depend on that speed; the foregoing mentioned speed and volume of vacuum may be controlled by opening or closing the valve I01.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is:

1. In resuscitation apparatus of the class described, in combination, a source of supply of oxygen under pressure, an instrumentality for administering the oxygen to a patient, passage means connecting the oxygen source to the said instrumentality, a valve chamber a valve in said chamber for controlling said passage means,

said valve being formed to gradually open the passage means when the valve is moved to supply oxygen to thesaid administering instrumentality, a motor connected with said valve for operating the same, and means for venting the oxygen flowing to the administering instrumentality from the said passage means, when a predetermined. resistance to the flow of oxygen from the said instrumentality is met with.

2. In resuscitation apparatus of the class described, in combination, a source of oxygen under pressure, an oxygen administering instrumentality foruapplication to a person, passage means connecting the oxygen source with the said instrumentality, valve means in said passage means for controlling the quantity of oxygen supplied to the administering instrumentality through said passage means, means for operating the said valve means, a passage leading to the atmosphere and connected with the aforesaid passage means for venting oxygen from the latter when the flow of oxygen from the administering instrumentality meets with a predetermined resistance, said venting means comprising means for normally preventing the venting action of the venting means, and constituting an indicator for determining the pressure of the oxygen supplied to the passage means during the normal action of the administering instrumentalit and valve means to temporarily in capacitate the venting means independently of said resistance condition.

3. In resuscitation apparatus ofthe class described, in comb-ination, a source of supply of oxygen under pressure, an instrumentality for administering the oxygen to a patient, passage means connecting the oxygen source to the :said instrumentality, a valve chamber, a valve in said chamber for controlling said passage means, said valve being constructed of tapered formation opposite to the passage means to gradually open the passage means when the valve is moved to supply oxygen to the said administering instrumentality, a motor connected with said valve for operating the same, and means for venting the oxygen flowing to'the administering instrumentality from the said passage means, when a predetermined resistance to the flow of oxygen from the said instrumentality is met with.

4. In resuscitation apparatus of the class described, in combination, a source of oxygen under pressure, an oxygen administering instrumentality for application to a person, passage means connecting the oxygen source with the said instrumentality, valve means in said passage means for controlling the quantity of oxygen supplied to the administering instrumentality through said passage means, means for operating the said valve means, a passage leading to the atmosphere and connected with the aforesaid passage means for venting oxygen from the latter when the flow of oxygen from the administering instrumentality meets with a predetermined resistance, said venting means comprising means for normally preventing the venting action of the venting means, and valve means to temporarily incapacitate the venting means independently of said resistance condition.

MORRIS DANN. 

